Door bolt



v. D. TOCCHETTO 2,905,494

Sept. 22, 1959 DOOR BOLT Filed March 28, 1955 United States Patent i DOOR BOLT Virgil Dante Tocchetto, Montevideo, Uruguay Application March 28, 1955, Serial No. 497,144

1 Claim. (Cl. 292-182) This invention relates to a door catch to be installed as well on doors as on windows or furniture, trunks or chests and more particularly to improvements of same, with the object of simplifying and strengthening the bolting structure without drawback to its efficiency.

The improvement referred to is applied to means operating the latch of the catch mechanism whose travel from throw to retraction is governed by the action of a reciprocating part of simple structure excluding the risk of a break down during operation.

It is an object of this invention to provide a catch whose latch is built to make a long stroke so that it may enter deeply into the receptacle in the framing suitable to receive it in locking position. The inventive improvement consists among other inventive features in the shape of a slot or cut-out guiding or rather to be guided by the movements of an eccentric disk or cam said slot being suitable to receive at least partially said cam when its eccentricity is turned into the direction of the travel of the latch whereby a plunge of satisfactory depth of the latch into the door frame is obtained even where only a very small closing is used.

In the drawings,

Fig. 1 shows a sectional side view of the improved catch with its latch retracted,

Fig. 2 shows the same subject as Fig. 1, the latch being thrown into locking position,

Fig. 3 shows the housing of the catch in perspective,

Fig. 4 illustrates a perspective presentation of the latch itself,

Fig. 5 is a perspective view of the circular cam controlling the latch by its eccentricity,

Fig. 6 is an external presentation of the assembled catch in perspective.

According to Fig. 1 the catch comprises a casing or housing a, built up by a base plate 1, integral with the side plates 2 and having at its front a closing plate 3 which projects beyond the said housing thus forming flanges 4 suitable for fastening the catch to the door or the like by means of head screws 5. Latch 6 is slidably housed in casing a, said latch being a rectangular body, having a central, longitudinal slot 7, said slot being traversed by pin 8, said pin being supported in the side plates of housing a. Pin 8 acts as a baflle to a spring 9 inserted in said slot 7, so as to create a tendency for retraction of the latch to its non-locking position in which pin 8 is situated close to the front end of slot 7.

Weight should be given to the statement that spring 7 is not essential for retraction of the latch since latch 6 may be moved by the action of cam 11. This fact may be of a special importance in the case of a break-down of the spring because an accident of the sort would not prevent operation of the catch. A cut out within latch 6 is substantially elliptical and formed with an arcuate recess 10. Fitting to said recess there is a circular eccentric cam 11 with sockets 12 at each of its sides said sockets being supported in the side walls of housing a, while stem 17 with handle 18 being of square cross section traverses both the side walls and said cam, whereby the latter is revolved following the impulsion given to handle 18.

The arcuate recess mentioned above is part of a cut-out 2,905,494 Patented Sept. 22, 1959 of more or less elliptical configuration with its larger axis perpendicular to the travel of the latch.

When the eccentric disk is rotated, its periphery engages the wall of the cut-out to move the latch, the retracted position being shown in Fig. 1 and the latching position in Fig. 2. When the disk has been rotated to a position closest to the front plate 3, the disk seats in the arcuate recess under the influence of spring 9, thereby resisting any tendency of the disk to move away from its latching position.

Plate 6, forming the latch is slidably secured by two longitudinally parallel ridges 13 formed on the side walls of the latch, which ridges 13 corresponding with grooves provided in the insides of the casing secure an unobstructed travel of latch 6 across slot 14 located in the afore-mentioned closing plate 3.

Figs. 3 to 6 inclusive show details of the characteristic features of the catch which are self-explanatory.

The embodiment of the invention shown in the annexed drawings and described in the specification is therefore to be understood as an illustration merely, while modifications and changes thereof may be made by men skilled in the art without departing from the spirit of the invention.

It is also understood that the catch may be made of all sorts of materials appropriate for the miscellaneous purposes. It should however be further understood that common to all modifications should be the inventive placement of the cam with respect to the cut-out within which it is lodged. That is, a location which permits the entrance of the cam into the surrounding material to a great deal in locking position, whereby it is possible to reduce the usual size of lock and catches of that kind very considerably and makes them especially appropriate for portable containers.

Having now fully described the nature of my invention and an embodiment which I presently think to be best, what I claim and wish to protect by Letters Patent, 1s:

A door catch comprising a housing having an opening in a wall thereof, a latch slidably mounted in said housing for rectilinear movement between a latching position in which a portion of said latch projects through said opening, and a position in which said latch is fully retracted within said housing, means for guiding said latch in said movement, spring means for urging said latch to its retracted position, said latch being formed with a cutout of substantially elliptical shape having its major axis perpendicular to the direction of movement of said latch, a circular disk positioned in said cut-out, and mounted in said housing for rotation about an eccentric axis perpendicular to the direction of movement of said latch, the periphery of said disk engaging the wall of said cutout as it rotates, to move said latch from its retracted position to its latching position, the portion of the wall of the cut-out nearest said wall of the housing being formed with an arcuate recess having a curvature corresponding to that of the periphery of said disk so as to partially embrace said disk when the latter is rotated to a position closest to said wall of said housing.

References Cited in the file of this patent UNITED STATES PATENTS 173,803 Miner Feb. 22, 1876 241,998 King May 24, 1881 308,885 Eames et al. Dec. 9, 1884 477,801 Hayes June 28, 1892 758,333 Pfleghar Apr. 26, 1904 1,264,840 Nemeth Apr. 30, 1918 1,679,955 Bartholomew Aug. 7, 1928 2,253,496 Cordrey et a1. MM.- A1 5 26, 941- 

